public class Test08 {
    public int takeAttendance(int[] records) {

        int left = 0 ,right = records.length -1;
        int mid = 0;
        while(left < right){
            mid = left + (right - left) / 2;
            if(records[mid] == mid) left = mid + 1;
            else right = mid;
        }
        if(records[left] == left) return left+ 1;
        return left;

    }
}
